Im not overly familiar with these SMB devices but you could try a factory reset if your getting nothing from it , it may wipe whatever happened when you connected the PI , sounds like a software/ firmware corruption
http://sbkb.cisco.com/ciscosb/getarticle.aspx?docid=89781d77bc354c298692bc15fc6b2f3b_resetting_through_the_reset_button_and_gui_.xml&pid=2&converted=0